using System;
using System.Runtime.InteropServices;

namespace Nikse.SubtitleEdit.Core
{
    /// <summary>
    /// Windows 7+ taskbar list - http://msdn.microsoft.com/en-us/library/windows/desktop/dd391692%28v=vs.85%29.aspx
    /// </summary>
    public static class TaskbarList
    {
        private static readonly Lazy<bool> SupportedLazy = new Lazy<bool>(() => Environment.OSVersion.Version >= new Version(6, 1));
        private static readonly Lazy<ITaskbarList3> TaskbarListLazy = new Lazy<ITaskbarList3>(() => (ITaskbarList3)new CLSID_TaskbarList());

        public static bool Supported { get { return SupportedLazy.Value; } }
        internal static ITaskbarList3 Taskbar { get { return TaskbarListLazy.Value; } }

        public static void MarkFullscreenWindow(IntPtr hwnd, bool fullScreen)
        {
            if (Supported && hwnd != IntPtr.Zero)
                Taskbar.MarkFullscreenWindow(hwnd, fullScreen ? 1 : 0);
        }

        public static void SetProgressState(IntPtr hwnd, TaskbarButtonProgressFlags state)
        {
            if (Supported && hwnd != IntPtr.Zero)
                Taskbar.SetProgressState(hwnd, state);
        }

        public static void SetProgressValue(IntPtr hwnd, double value, double max)
        {
            if (Supported && hwnd != IntPtr.Zero)
                Taskbar.SetProgressValue(hwnd, (ulong)value, (ulong)max);
        }

        [ClassInterface(ClassInterfaceType.None),
         ComImport, Guid("56FDF344-FD6D-11d0-958A-006097C9A090")]
        private class CLSID_TaskbarList
        {
        }

    }

    /// <summary>Extends ITaskbarList2 by exposing methods that support the unified launching and switching
    /// taskbar button functionality added in Windows 7. This functionality includes thumbnail representations
    /// and switch targets based on individual tabs in a tabbed application, thumbnail toolbars, notification
    /// and status overlays, and progress indicators.</summary>
    [ComImport, Guid("ea1afb91-9e28-4b86-90e9-9e9f8a5eefaf"),
     InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    internal interface ITaskbarList3
    {
        // ITaskbarList

        /// <summary>Initializes the taskbar list object. This method must be
        /// called before any other ITaskbarList methods can be called.</summary>
        void HrInit();

        /// <summary>Adds an item to the taskbar.</summary>
        /// <param name="hWnd">A handle to the window to be
        /// added to the taskbar.</param>
        void AddTab(IntPtr hWnd);

        /// <summary>Deletes an item from the taskbar.</summary>
        /// <param name="hWnd">A handle to the window to be deleted
        /// from the taskbar.</param>
        void DeleteTab(IntPtr hWnd);

        /// <summary>Activates an item on the taskbar. The window is not actually activated;
        /// the window’s item on the taskbar is merely displayed as active.</summary>
        /// <param name="hWnd">A handle to the window on the taskbar to be displayed as active.</param>
        void ActivateTab(IntPtr hWnd);

        /// <summary>Marks a taskbar item as active but does not visually activate it.</summary>
        /// <param name="hWnd">A handle to the window to be marked as active.</param>
        void SetActiveAlt(IntPtr hWnd);
        // ITaskbarList2

        /// <summary>Marks a window as full-screen</summary>
        /// <param name="hWnd"></param>
        /// <param name="fullscreen"></param>
        void MarkFullscreenWindow(IntPtr hWnd, int fullscreen);

        /// <summary>Displays or updates a progress bar hosted in a taskbar button to show
        /// the specific percentage completed of the full operation.</summary>
        /// <param name="hWnd">The handle of the window whose associated taskbar button is being used as
        /// a progress indicator.</param>
        /// <param name="ullCompleted">An application-defined value that indicates the proportion of the
        /// operation that has been completed at the time the method is called.</param>
        /// <param name="ullTotal">An application-defined value that specifies the value ullCompleted will
        /// have when the operation is complete.</param>
        void SetProgressValue(IntPtr hWnd, ulong ullCompleted, ulong ullTotal);

        /// <summary>Sets the type and state of the progress indicator displayed on a taskbar button.</summary>
        /// <param name="hWnd">The handle of the window in which the progress of an operation is being
        /// shown. This window’s associated taskbar button will display the progress bar.</param>
        /// <param name="tbpFlags">Flags that control the current state of the progress button. Specify
        /// only one of the following flags; all states are mutually exclusive of all others.</param>
        void SetProgressState(IntPtr hWnd, TaskbarButtonProgressFlags tbpFlags);

        /// <summary>Informs the taskbar that a new tab or document thumbnail has been provided for
        /// display in an application’s taskbar group flyout.</summary>
        /// <param name="hWndTab">Handle of the tab or document window. This value is required and cannot
        /// be NULL.</param>
        /// <param name="hWndMDI">Handle of the application’s main window. This value tells the taskbar
        /// which application’s preview group to attach the new thumbnail to. This value is required and
        /// cannot be NULL.</param>
        void RegisterTab(IntPtr hWndTab, IntPtr hWndMDI);

        /// <summary>Removes a thumbnail from an application’s preview group when that tab or document is closed in the application.</summary>
        /// <param name="hWndTab">The handle of the tab window whose thumbnail is being removed. This is the same
        /// value with which the thumbnail was registered as part the group through ITaskbarList3::RegisterTab.
        /// This value is required and cannot be NULL.</param>
        void UnregisterTab(IntPtr hWndTab);

        /// <summary>Inserts a new thumbnail into a tabbed-document interface (TDI) or multiple-document
        /// interface (MDI) application’s group flyout or moves an existing thumbnail to a new position in
        /// the application’s group.</summary>
        /// <param name="hWndTab">The handle of the tab window whose thumbnail is being placed. This value
        /// is required, must already be registered through ITaskbarList3::RegisterTab, and cannot be NULL.</param>
        /// <param name="hWndInsertBefore">The handle of the tab window whose thumbnail that hwndTab is
        /// inserted to the left of. This handle must already be registered through ITaskbarList3::RegisterTab.
        /// If this value is NULL, the new thumbnail is added to the end of the list.</param>
        void SetTabOrder(IntPtr hWndTab, IntPtr hWndInsertBefore);

        /// <summary>Informs the taskbar that a tab or document window has been made the active window.</summary>
        /// <param name="hWndTab">Handle of the active tab window. This handle must already be registered
        /// through ITaskbarList3::RegisterTab. This value can be NULL if no tab is active.</param>
        /// <param name="hWndMDI">Handle of the application’s main window. This value tells the taskbar
        /// which group the thumbnail is a member of. This value is required and cannot be NULL.</param>
        /// <param name="tbatFlags">None, one, or both of the following values that specify a thumbnail
        /// and peek view to use in place of a representation of the specific tab or document.</param>
        void SetTabActive(IntPtr hWndTab, IntPtr hWndMDI, UInt32 tbatFlags);

        /// <summary>Adds a thumbnail toolbar with a specified set of buttons to the thumbnail image of a window
        /// in a taskbar button flyout.</summary>
        /// <param name="hWnd">The handle of the window whose thumbnail representation will receive the toolbar.
        /// This handle must belong to the calling process.</param>
        /// <param name="cButtons">The number of buttons defined in the array pointed to by pButton. The maximum
        /// number of buttons allowed is 7.</param>
        /// <param name="pButton">A pointer to an array of THUMBBUTTON structures. Each THUMBBUTTON defines an
        /// individual button to be added to the toolbar. Buttons cannot be added or deleted later, so this must
        /// be the full defined set. Buttons also cannot be reordered, so their order in the array, which is the
        /// order in which they are displayed left to right, will be their permanent order.</param>
        void ThumbBarAddButtons(IntPtr hWnd, uint cButtons, [MarshalAs(UnmanagedType.LPArray)] ThumbButton[] pButton);

        /// <summary>Shows, enables, disables, or hides buttons in a thumbnail toolbar as required by the
        /// window’s current state. A thumbnail toolbar is a toolbar embedded in a thumbnail image of a window
        /// in a taskbar button flyout.</summary>
        /// <param name="hWnd">The handle of the window whose thumbnail representation contains the toolbar.</param>
        /// <param name="cButtons">The number of buttons defined in the array pointed to by pButton.
        /// The maximum number of buttons allowed is 7. This array contains only structures that represent existing buttons that are being updated.</param>
        /// <param name="pButton">A pointer to an array of THUMBBUTTON structures. Each THUMBBUTTON defines an individual button. If the button already exists
        /// (the iId value is already defined), then that existing button is updated with the information provided in the structure.</param>
        void ThumbBarUpdateButtons(IntPtr hWnd, uint cButtons, [MarshalAs(UnmanagedType.LPArray)] ThumbButton[] pButton);

        /// <summary>Specifies an image list that contains button images for a toolbar embedded in
        /// a thumbnail image of a window in a taskbar button flyout.</summary>
        /// <param name="hWnd">The handle of the window whose thumbnail representation contains the
        /// toolbar to be updated. This handle must belong to the calling process.</param>
        /// <param name="himl">The handle of the image list that contains all button images to be used in the toolbar.</param>
        void ThumbBarSetImageList(IntPtr hWnd, IntPtr himl);

        /// <summary>Applies an overlay to a taskbar button to indicate application status or a notification to the user.</summary>
        /// <param name="hWnd">The handle of the window whose associated taskbar button receives the overlay.
        /// This handle must belong to a calling process associated with the button’s application and must be
        /// a valid HWND or the call is ignored.</param>
        /// <param name="hIcon">The handle of an icon to use as the overlay. This should be a small icon,
        /// measuring 16×16 pixels at 96 dots per inch (dpi). If an overlay icon is already applied to the
        /// taskbar button, that existing overlay is replaced.</param>
        /// <param name="pszDescription">A pointer to a string that provides an alt text version of the
        /// information conveyed by the overlay, for accessibility purposes.</param>
        void SetOverlayIcon(IntPtr hWnd, IntPtr hIcon, string pszDescription);

        /// <summary>Specifies or updates the text of the tooltip that is displayed when the mouse
        /// pointer rests on an individual preview thumbnail in a taskbar button flyout.</summary>
        /// <param name="hWnd">The handle to the window whose thumbnail displays the tooltip.
        /// This handle must belong to the calling process.</param>
        /// <param name="pszTip">The pointer to the text to be displayed in the tooltip. This value can
        /// be NULL, in which case the title of the window specified by hwnd is used as the tooltip.</param>
        void SetThumbnailTooltip(IntPtr hWnd, string pszTip);

        /// <summary>Selects a portion of a window’s client area to display as that window’s thumbnail in the taskbar.</summary>
        /// <param name="hWnd">The handle to a window represented in the taskbar.</param>
        /// <param name="prcClip">A pointer to a RECT structure that specifies a selection within the window’s
        /// client area, relative to the upper-left corner of that client area. To clear a clip that is already
        /// in place and return to the default display of the thumbnail, set this parameter to NULL.</param>
        void SetThumbnailClip(IntPtr hWnd, IntPtr prcClip);
    }

    internal enum ThumbButtonMask
    {
        Bitmap = 0x1,
        Icon = 0x2,
        Tooltip = 0x4,
        Flags = 0x8
    }

    public struct ThumbButton
    {
#pragma warning disable 0169

        private ThumbButtonMask _mask;
        private uint _id;
        private uint _bitmap;
        private IntPtr _icon;

        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 260)]
        public string Tip;
        private ThumbButtonFlags _flags;

#pragma warning restore 0169
    }

    [Flags]
    internal enum ThumbButtonFlags
    {
        Enabled = 0,
        Disabled = 0x1,
        DismissionClick = 0x2,
        NoBackground = 0x4,
        Hidden = 0x8,
        NonInteractive = 0x10
    }

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1027:MarkEnumsWithFlags")]
    public enum TaskbarButtonProgressFlags
    {
        NoProgress = 0,
        Indeterminate = 0x1,
        Normal = 0x2,
        Error = 0x4,
        Paused = 0x8
    }

}